Power takeoff on marine diesel engine

ABSTRACT

A hydraulic pump is mounted as an accessory on a marine diesel engine to operate hydraulic equipment on a boat. The driving connection includes a double universal joint which eliminates side loading on the engine shaft which is utilized for driving the pump whereby the pump may be driven from one of the engine cam shafts. An intermediate member is resiliently mounted on a pair of axially spaced rubber O-rings on a driven hub member on the pump shaft. One end of the intermediate member is equipped with a circle of axial pins which fit loosely in a circle of holes in the hub member to provide one of the universal joints. A driving member bolted to the engine cam gear has a circle of axial pins which fit loosely in a circle of holes in the other end of the intermediate member to form a second universal joint. The hub member and intermediate member are mounted in a sleeve for axial sliding movement in a housing bolted to the engine housing. The pump is mounted on the sleeve. By sliding the pump and sleeve bodily toward the engine, the last named pins and holes cooperate as a dental clutch to drive the pump. By sliding the pump bodily away from the engine, the last named pins and holes are disengaged from each other to declutch the pump. This sliding movement is effected by a hand lever and a spring detent is provided to hold the clutch parts in engaged and disengaged positions.

United States Patent Junes Feb. 22, 1972 [72] Inventor: Norman E. Junes,Route 3, Box 148,

Astoria, Oreg. 97103 [22] Filed: July 6, 1970 [21] Appl. No.: 52,641

[52] US. Cl. ..l23/l98 C, 64/10, 74/ 15.63, 123/195 A, 192/67 P [51]Int. Cl ..F02b 77/00, F16d 11/04, Fl6d 3/48 [58] FieldotSearch..'.....64/10',74/15.6, 15.63; 123/195 A, 198 C; 192/67 R, 67 P; 418/69[56] References Cited UNITED STATES PATENTS 2,686,999 8/1954 Smith....192/67 R X 575,620 1/1897 Seymour. ....192/67 R X 2,202,455 S/1940Klavik 123/195 A X 3,435,778 4/1969 Ascuitto et a1.. ..74/ 15.63 294,6723/1884 Proctor .192/67 R X 1,607,362 11/1926 Powers ...64/10 X 2,772,54812/1956 Covington, Jr. et al ..64/l0 X 2,404,017 7/1946 Wilkinson ..123/195 A X 1,647,879 ll/1927 Miller 197/67 R X 3,424,287 1/ 1969 Dreiding....192/67 R X 752,572 2/ 1904 Macfarlane ....l92/67 R X 2,917,01912/1959 Krueger .,....l92/67 R Primary Examiner-Allan D. l-lerrmannAttorney-Lee R. Schermerhorn ABSTRACT A hydraulic pump is mounted as anaccessory on a marine diesel engine to operate hydraulic equipment on aboat. The driving connection includes a double universal joint whicheliminates side loading on the engine shaft which is utilized fordriving the pump whereby the pump may be driven from one of the 1 enginecam shafts. An intermediate member is resiliently mounted on a pair ofaxially spaced rubber O-rings on a driven hub member on the pump shaft.One end of the intermediate member is equipped with a circle of axialpins which fit loosely in a circle of holes in the hub member to provideone of the universal joints. A driving member bolted to the engine camgear has a circle of axial pins which fit loosely in a circle of holesin the other end of the intermediate member to form a second universaljoint. The hub member and intermediate member are mounted in a sleevefor axial sliding movement in a housing bolted to the engine housing.The pump is mounted on the sleeve. By sliding the pump and sleeve bodilytoward the engine, the last named pins and holes cooperate as a dentalclutch to drive the pump. By sliding the pump bodily away from theengine, the last named pins and holes are disengaged from each other todeclutch the pump. This sliding movement is effected by a hand lever anda spring detent is provided to hold the clutch parts in engaged and disengaged positions.

7 Claims, 3 Drawing Figures PAIENTEDFEBZZ. I972 3.643 .642

INVENTOR NORMAN E. JUNES flitarney POWER TAKEOFF ON MARINE DIESEL ENGINEBACKGROUND OF THE INVENTION This'invention relates to a power takeofi'on an engine and has particular reference to a power takeoff for ahydraulic pump on a marine diesel engine to operate hydraulic equipmenton a boat.

Hydraulic power is commonly used to power salmon gurdies, tuna linepullers, crab fishing gears, anchor winches and many other devices onfishing boats. Pleasure boats also have need for hydraulic equipment.

Available power takeoffs for driving hydraulic pumps and the like areexpensive in first cost and have various operational disadvantages. Theyare usually difficult to install and utilize belts and belt tightenerswhich give trouble and are frequently subject to failure. Also, the sideloading imposed by a conventional belt drive limits the connection ofsuch power takeoffs to shafts that are capable of withstanding the sideloading and this makes the power takeoff installation objectionablycumbersome in the limited space usually available on a small boat.

Objects of the present invention are, therefore, a to provide animproved power takeoff for an engine, to provide a power takeoffespecially adapted for mounting a hydraulic pump on a marine dieselengine, to provide a power takeoff which does not impose side loading onthe pump shaft nor on the engine shaft which is utilized to furnish thepower, to provide. a power takeoff having a double universal joint andto provide a power takeoff in which the accessory device is moved bodilyrelative to the engine to clutch and declutch the device.

SUMMARY OF THE INVENTION The present device may be driven safely fromone of the cam shafts of a marine diesel engine. It may be mounted oneither the right or left side utilizing available space above thereduction gear. In the illustrative embodiment, the power takeoff isassociated with a hydraulic pump for operating hydraulic equipment on aboat.

An intermediate member is resiliently mounted on a special hub on thepump shaft by means of two axially spaced resilient O-rings. One end ofthe intermediate member has a circle of axial pins which enter looselyinto a circle of holes in the hub member to provide one of the universaljoints. A driving member bolted to the engine cam gear has a circle ofaxial pins which enter loosely into a circle of holes in the other endof the intermediate member to provide a second universal joint. Thesetwo universal joints cooperate to avoid side loading on the engine camshaft and pump shaft.

The parts described above are contained in a sleeve which is bolted tothe pump housing and has longitudinal sliding movement in a housingbolted to the engine housing. By sliding the pump and sleeve bodilytoward or away from the engine, the last named pins and holes may beengaged with each other or disengaged to provide a dental clutch. Alongitudinal guide pin on the sleeve prevents rotation of the sleeve andpump housing. Reciprocation is effected by a hand lever and depressionsin the guide pin are engaged by a spring detent to hold the clutcheither engaged or disengaged.

The invention will be better understood and additional objects andadvantages will be apparent from the following description of thepreferred embodiment illustrated on the accompanying drawing. Variouschanges may be made, however, in the details of construction andarrangement of parts and certain features may be used without others.All such modifications within the scope of the appended claims areincluded in the invention. The invention is not limited to use with ahydraulic pump nor is it limited to use with a marine diesel engine.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a side elevation view of amarine diesel engine equipped with a power takeoff embodying theinvention;

FIG. 2 is an exploded perspective view of the power takeoff; and

FIG. 3 is a longitudinal sectional view.

DESCRIPTION OF THE PREFERRED EMBODIMENT In FIG. 1 the numeral designatesa common type of marine diesel engine which drives a propeller shaft 11through a conventional reduction gear in reduction gear housing 12. Ahydraulic pump 13 is mounted on the engine as an accessory by means of apower takeoff. unit 15 embodying the invention.

Above the reduction. gear unit 12 the engine has a pair of camshafts asexemplified bythe camshaft 16 in FIG. 3. Each camshaft is mounted in arear bearing 17 which is not designed to withstand side loadingwherebythe camshaft cannot be utilized for-driving conventional power takeoffswhich impose a substantial side loading. The camshaft does, however,develop adequate torque-beyond the needs of the engine for driving thehydraulic pump 13 without any objectionable wear and tear on thecamshaft or other parts of the engine if side loading is avoided.Camshaft -l6 isdriven by a cam gear 18 which is fixedly mounted on theshaft and secured by nut 19. The present power takeoff does not requireany alteration of the mounting of the gear on the shaft.

The power takeoff has a driving member 20 secured to gear 18 bycapscrews 21 in a flange 22 of the driving member. Driving member 20 isreadily insertable through an opening 23 in engine housing member 24which is normally closed by a cover plate. In installing the powertakeoff, the only alteration to the engine involves the removal of thecover plate from opening 23. Projecting rearward from the end of drivingmember 20 is a circle of axially directed,.cylindrical dental clutchpins 25. Y

A support housing is mounted on engine housing 24 by means of capscrews,31 which have threaded engagement in holes 32 about the opening 23 forthe cover .plate screws which were removed. Housing 30 containsacylindrical bore 34 to receive a sleeve 35. The outer or rear end ofsleeve 35 is secured to the end. of pump housing 13 by screws 36. Thesleeve is lubricated for sliding movement in bore 34 by means of acup-shaped depression 37 which drains into bore 34 through a slopingpassageway 38. Depression 37 operates as a sump to collect oil thrown upby the cam gear drive mechanism.

A hum member 40 is pressed on pump shaft 41 and drives the pump shaftthrough key 42 and spline groove 43. An annular intermediate member 45is resiliently mounted on hub 40 by means of two axially spaced rubberO-rings 46 which are seated in confronting grooves 47 in the twomembers. The inside diameter of member 45 is larger than the outsidediameter of hub member 40 to allow rocking movement of member 45 on thehub member.

Projecting rearward from-annular member 45 is a circle of axiallydirected, cylindrical pins 50 which enter loosely into a circle of holes51 in an end flange ,on hub member 40, the holes being slightly largerthanthe pins. Annular member 45 is secured to hum member 40 by aresilient retainer ring 52 engaged in notches 53 inthe pins 50. Thus,the annular member 45 is free to. shift and rock a short distance in alldirections relative to hub member 40.

The forward end of annular member 45 contains a circle of axial holes 55to receive thepins 25, the holes being slightly larger, than the, pinsto permit relative movement in all directions between members 20 and 45.This clutch is engaged by moving the pump 13 bodily toward the engine 10by means of lever 60. Lever may be manipulated directly as a hand leveror it may be linked. by means of holes 61 with a hand lever in aconvenient position.,l..ever,60 is pivotally mounted on sleeve 35 bymeans of a hole 62 which provides pivotal support on a screw 63 in abracket 64 on the flange 68 of the sleeve. A fulcrum for this movementis provided by a notch 65 in the lower end of the. lever which straddlesa screw 66 mounted in a hole 67 in housing 30.

Rotation of the sleeve 35 and pump housing 13 is prevented by a guide-.pin -70 which. projects forward from the sleeve flange 68. Guide pin70 slides in an axial bore 71 in housing 30 and contains a pair ofspaced apart depressions 72 to receive a detent 73. Detent 73 iscontained in a transverse bore 74 in housing 30 and is spring pressedagainst guide pin 70 by a compression spring 75 which is retainer inbore 74 by a threaded cap 76. The depressions 72 are positioned so thatdetent 73 will engage one of the depressions when the clutch isdisengaged as shown in FIG. 3 and will engage the other depression whenthe sleeve 35 and driven member 45 are shifted forward to engage thepins 25 in holes 55.

The clutch will readily engage when the engine is throttled down to slowspeed. Since the pins 25 and holes 55 are distributed about the axis ofrotation and since all of the pins enter the holes 55 simultaneously,the engaging of the clutch does not impose any side loading on camshaft16 and, obviously, the driving of pump 13 after clutch engagement doesnot produce any side loading. Any lateral or angular misalign mentbetween shafts l6 and 41 resulting from lack of precision in manufactureis readily accommodated by the double universal joint. The looseengagement of pins 25 in holes 55 constitutes a first universal jointand the loose engagement of pins 50 in holes 51 constitutes a seconduniversal joint. Annular member 45 constitutes a flexible and resilientlink or intermediate member between driving member 20 and the driven hub40 which link prevents any possibility of side loading on camshaft 16under any operating conditions.

What is claimed is:

l. A power takeoff for an engine comprising a housing adapted formounting on an engine housing, a sleeve mounted for sliding movement insaid first housing, means for mounting on said sleeve a unit ofaccessory equipment having a shaft, a hub on said shaft, an annularmember resiliently mounted on said hub, a universal joint connectionbetween said hub and one end of said annular member, a driving memberadapted for connection with a camshaft gear in said engine, and auniversal joint connection between said driving member and the oppositeend of said annular member, sliding movement of said sleeve separatingone of said universal joint connections to form a clutch for the powertakeoff.

2. A power takeoff as defined in claim 1, each of said universal jointconnections comprising a circle of axial pins loosely engaged in acircle of holes.

3. A power takeoff as defined in claim 1, said resilient mounting ofsaid annular member on said hub comprising rubber O-rings interposedbetween the external surface of said hub and the internal surface ofsaid annular member.

4. A power takeoff as defined in claim 1, said unit of accessoryequipment comprising a hydraulic pump.

5. A power takeofi as defined in claim 1 including an axial guide pin onsaid sleeve, and an axial bore in said first housing slidably receivingsaid guide pin to prevent rotation of said sleeve.

6. A power takeoff as defined in claim 1, said first universal jointconnection comprising a circle of axial pins on said one end of saidannular member loosely engaged in a circle of axial holes in said hub,and said second universal joint connection comprising a circle of axialpins on said driving member loosely engaged in a circle of axial holesin said opposite end of said annular member, sliding movement of saidsleeve away from said driving member separating said last holes fromsaid last pins to disengage said clutch.

7. A power takeoff for an engine comprising a housing adapted formounting on an engine housing, a sleeve mounted for sliding movement insaid first housing, an axial bore in said first housing outside of saidsleeve, an axial guide pin on said sleeve slidable in said bore toprevent rotation of said sleeve, means for mounting on said sleeve aunit of accessory equipment having a shaft, a hub on said shaft, a pairof resilient rubber O-rings on said hub, an annular member mounted onsaid O-rings, a circle of axial pins on one end of said annular memberloosely engaged in a circle of axial holes in said hub, a driving memberadapted for connection with a camshaft gear in said engine, and a circleof axial pins on said driving member loosely engaged in a circle ofaxial holes in the opposite end of said annular member, sliding movementof said sleeve away from said driving member separating said last holesfrom said last pins to disconnect said annular member and said hub fromsaid driving member.

1. A power takeoff for an engine comprising a housing adapted formounting on an engine housing, a sleeve mounted for sliding movement insaid first housing, means for mounting on said sleeve a unit ofaccessory equipmEnt having a shaft, a hub on said shaft, an annularmember resiliently mounted on said hub, a universal joint connectionbetween said hub and one end of said annular member, a driving memberadapted for connection with a camshaft gear in said engine, and auniversal joint connection between said driving member and the oppositeend of said annular member, sliding movement of said sleeve separatingone of said universal joint connections to form a clutch for the powertakeoff.
 2. A power takeoff as defined in claim 1, each of saiduniversal joint connections comprising a circle of axial pins looselyengaged in a circle of holes.
 3. A power takeoff as defined in claim 1,said resilient mounting of said annular member on said hub comprisingrubber O-rings interposed between the external surface of said hub andthe internal surface of said annular member.
 4. A power takeoff asdefined in claim 1, said unit of accessory equipment comprising ahydraulic pump.
 5. A power takeoff as defined in claim 1 including anaxial guide pin on said sleeve, and an axial bore in said first housingslidably receiving said guide pin to prevent rotation of said sleeve. 6.A power takeoff as defined in claim 1, said first universal jointconnection comprising a circle of axial pins on said one end of saidannular member loosely engaged in a circle of axial holes in said hub,and said second universal joint connection comprising a circle of axialpins on said driving member loosely engaged in a circle of axial holesin said opposite end of said annular member, sliding movement of saidsleeve away from said driving member separating said last holes fromsaid last pins to disengage said clutch.
 7. A power takeoff for anengine comprising a housing adapted for mounting on an engine housing, asleeve mounted for sliding movement in said first housing, an axial borein said first housing outside of said sleeve, an axial guide pin on saidsleeve slidable in said bore to prevent rotation of said sleeve, meansfor mounting on said sleeve a unit of accessory equipment having ashaft, a hub on said shaft, a pair of resilient rubber O-rings on saidhub, an annular member mounted on said O-rings, a circle of axial pinson one end of said annular member loosely engaged in a circle of axialholes in said hub, a driving member adapted for connection with acamshaft gear in said engine, and a circle of axial pins on said drivingmember loosely engaged in a circle of axial holes in the opposite end ofsaid annular member, sliding movement of said sleeve away from saiddriving member separating said last holes from said last pins todisconnect said annular member and said hub from said driving member.